SKY77148 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – PA Module for CDMA2000 (450-460 MHz)

PRODUCT SUMMARY
SKY77148: PA Module for CDMA2000 (450–460 MHz)
APPLICATIONS
• Digital cellular (CDMA2000)
• Wireless Local Loop (WLL)
FEATURES
• Low voltage positive bias supply
(3.2 V to 4.2 V)
• Good linearity
• High efficiency across wide
dynamic range
• Dual-mode operation
• 7-pin package
6 mm x 6 mm x 1.5 mm
• Power down control
• Low power state control
• CDMA2000
The SKY77148 Power Amplifier Module (PAM) is a fully matched 7-pin surface mount
module developed for Code Division Multiple Access (CDMA2000) handset and Wireless
Local Loop applications. This small and efficient power amplifier packs full coverage of the
450–460 MHz bandwidth into a single compact package. The device meets the stringent
CDMA2000 linearity requirements to and exceeding 29 dBm output power. A low current pin
(VCONT) provides improved efficiency for the low RF power range of operation.
The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains
all active circuitry within the module, which includes on-board bias circuitry as well as input
and interstage matching circuits. Output match into a 50 Ω load is realized off-chip within
the module package to optimize efficiency and power performance. This device is
manufactured with Skyworks’ GaAs Heterojunction Bipolar Transistor (HBT) process that
provides for all positive voltage DC supply operation while maintaining high efficiency and
good linearity. Primary bias to the SKY77148 is supplied directly from a three-cell nickel
cadmium, a single-cell lithium ion, or other suitable battery with a rated output in the 3.2 to
4.2 volt range. Setting the voltage on the low current reference pin to zero volts
accomplishes power down. No external supply side switch is needed as typical “off”
leakage is a few microamperes with full primary voltage from the battery.
VREF
(3)
VCC1
(1)
VCONT
(4)
VCC2
(5)
Driver
Stage Bias
Power
Stage Bias
RF IN (2)
Input
Match
DA
MMIC
Inter
Stage
PA
Match
Output
Match
(6) RF OUT
MODULE
103031P3
(7)
(7)
GND
GND
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc., Proprietary
[781] 376-7000 • FAX [781] 376-3100 • [e-mail] • WWW.SKYWORKSINC.COM
103031_001
MAY 29, 2003